FE_APT_Webshell_PL_SLIGHTPULSE_1
YARA detection rule by Mandiant · GPL-2.0
Rule FE_APT_Webshell_PL_SLIGHTPULSE_1 (No description metadata provided).
rule FE_APT_Webshell_PL_SLIGHTPULSE_1 {
meta:
author = "Mandiant"
date_created = "2021-04-16"
sha256 = "133631957d41eed9496ac2774793283ce26f8772de226e7f520d26667b51481a"
reference_url = "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
strings:
$r1 = /if[\x09\x20]{0,32}\(CGI::param\([\x22\x27]\w{1,64}[\x22\x27]\)[\x09\x20]{0,32}\)[\x09\x20]{0,32}\\\{[\x09\x20]{0,32}[\x09\x20]{0,32}\w{1,64}\([\x09\x20]{0,32}\)[\x09\x20]{0,32}\x3b[\x09\x20]{0,32}\\\}[\x09\x20]{0,32}elsif/
$r2 = /system[\x09\x20]{0,32}\([\x09\x20]{0,32}[\x22\x27]\$\w{1,64}[\x09\x20]{0,32}>[\x09\x20]{0,32}\/tmp\/\d{1,10}[\x09\x20]{1,32}2[\x09\x20]{0,32}>[\x09\x20]{0,32}&1[\x22\x27][\x09\x20]{0,32}\)[\x09\x20]{0,32}\x3b\s{0,128}open[\x09\x20]{0,32}\([\x09\x20]{0,32}\*\w{1,64}[\x09\x20]{0,32},[\x09\x20]{0,32}[\x22\x27][\x09\x20]{0,32}<[\x09\x20]{0,32}\$\w{1,64}[\x22\x27][\x09\x20]{0,32}\)[\x09\x20]{0,32}\x3b\s{0,128}while[\x09\x20]{0,32}\([\x09\x20]{0,32}<[\x09\x20]{0,32}\w{1,64}[\x09\x20]{0,32}\>[\x09\x20]{0,32}\)[\x09\x20]{0,32}\\\{/
$s1 = "CGI::param("
$s2 = "system("
$s3 = "Content-type: image/gif\\n\\n" nocase
condition:
all of them
}